Description of the upgrade
Various modifications to the analysis were implemented, the most significant of these being:
- a tighter first-guess check for AIREPs reporting zero wind speed;
- assigning single level pressure (height) observations to the first-guess pressure level instead of the reported pressure - this will remove spurious analysis increments in the temperature of the lowest model level;
- rather than having a uniform global threshold the SATEM stability check will be made dependent on the first-guess error standard deviation.